We are therefore going to break down this problem to know the root of the problem and how to fix it. The question of why the fuel light comes on when the tank is full is a problem many people face during their vehicle lifetime.ĭespite how easy this problem may look, it can make the driver feel worried on the road and be afraid to run out of fuel. To his surprise, he finds that the car only needs half of the tank to get fully refueled. Usually, the driver will stop at the nearest fuel station to get some fuel for their vehicle. The driver could be driving his car, and surprisingly the low fuel light comes on. With the unit out of the vehicle, you can further check to see if it’s a problem with the float, the resistor, or something else.In this article, we are going to talk about a major problem people experience in their cars. If the range, for example, is 0-70, it will read 0 ohms when the tank is empty and 70 ohms when the tank is full, or vice versa. Check your owner’s manual or service manual to determine the ohms range in which the fuel sending unit operates.Once you have the unit out, set your multimeter to ohms.If there is no resistance, you might need to remove the fuel sending unit to inspect and test further.If the voltage drops, the fuel gauge sending unit is creating the resistance it should. If you plug the connector back and test again, the fuel gauge sending unit should create resistance. The next step is to check for voltage drop.If the readings are incorrect, follow the circuit back and test until you find the issue. With the ignition to “on,” use a multimeter to check the voltage of the wiring and/or the connector that provides power to the sending unit.Read your service manual to determine the voltage standards and schematics for the fuel sending unit wiring or connector, depending on whether or not the unit is built into the fuel pump or outside of it.Check the ground wiring for any physical issues.Remove the necessary panels and parts for access.Check your owner’s manual to figure out how to access the fuel tank and fuel gauge sending unit.
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